Going backward from the version you want to end up with, 9.10.2.0.53 Release Notes sayyou need at least 9.9.0.0.205 (GA) to upgrade to this version. And 9.9 (GA) Release Notessay you can upgrade from 9.7.2.0.9 (MR2), so you need to go thru 9.9.0.0.205.